*{
	margin: 0;
	padding: 0;
	text-decoration: none;
	list-style: none;
}
ul{
	width: 530px;
	display: flex;
	justify-content: space-between;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	background-color: black;
	border: 1px solid palevioletred;
	
}
li{
	width: 100px;
	height: 5px;
	background-color: white;
}
li.active{
	width: 200px;
	
}
li::before{
	content: "";
	display: block;
	width: 0%;
	height: 100%;
	background-color: #87ceeb;
}
li.active::before{
	width: 100%;
	transition: all 3s ease-out;
}